I used to work for a company that started using Gitprime to measure developer productivity. Gitprime would show a nice dashboard with stack ranked employees based on their git commits. Besides the obvious effect that it had on cooperation (you don’t want to help another developer lest they go before you in the stack rank) it had also funny effect on the code we wrote. For example, replacing old code with new code was penalized as “code churn”, so we had to write something like

  if (false) {
    // old code
  }
  // new code

In Golang projects we avoided pushing the vendors directory in one commit. Instead we had to strategically commit it piece by piece to satisfy “frequent small commits” metric that apparently is a signature of good developers.